Hitachi Astemo Ltd.

Hitachi Automotive Systems, Ltd.

Hitachi Industrial Equipment Systems Co., Ltd.

Midori Takaoka

Toshiyuki Ajima

Takafumi Hara

Hirokazu Matsui

Akihiro Ashida

Junki Isobe

Hiroshi Tamura

Yoshitaka Iwaji

Kazuaki Tobari

Shigehisa Aoyagi

Kohei Myoen

Yusaku Onuma

Takuya Sugimoto

Shigeyuki Nonomura

A motor control device includes a PWM control unit, a carrier frequency setting unit, and a carrier frequency switching calculation unit. The PWM unite generates a signal to drive an inverter by pulse width modulation. The carrier frequency setting unit sets a carrier frequency used for pulse width modulation according to a number of rotations of a motor. The carrier frequency switching calculation unit calculates a frequency switching speed of the carrier frequency and is configured to perform a calculation method. The calculation method includes setting at least one of an emergency mode, a response priority mode, or a fluctuation suppression priority mode in response to various operating conditions.

Motor control device

A random value integration unitoutputs a random value output from a random value generation unitin a diffusion width Rand output from a diffusion width generation unitby a product of an output of the random value generation unitand an output of the diffusion width generation unit. A triangular wave signal generation unitgenerates a triangular wave signal corresponding to a second carrier frequency fcwhich is obtained by adding the random value output from the random value integration unitto a first carrier frequency fcwhich is an output of a carrier frequency setting unit. That is, a frequency obtained by increasing the diffusion width of the first carrier frequency fcis used as the second carrier frequency fc, and the second carrier frequency is used as the carrier frequency.

Motor control device and electric vehicle system

In a motor drive device, a phase compensation amount calculation unitcalculates a phase compensation amount &#x394;&#x3b8; for compensating a voltage phase &#x3b8;v* when a control mode is switched in a control selection unit. The control selection unitoutputs the three-phase voltage command Vuvw* according to any one of the plurality of control modes based on the modulation factor Kh*, the voltage phase &#x3b8;v*, and the phase compensation amount &#x394;&#x3b8;. A PWM control unitoutputs gate signals Gun, Gup, Gvn, Gvp, Gwn, and Gwv based on the three-phase voltage command Vuvw* and a rotor position &#x3b8;d. The inverterhas a plurality of switching elements, and controls the plurality of switching elements based on gate signals Gun, Gup, Gvn, Gyp, Gwn, and Gwv to drive the AC motor

Motor drive system

An object of the present invention is to reduce output voltage errors of an inverter circuit and stably control a motor until the motor reaches high speed rotation. An inverter device includes a PWM controller that generates a PWM pulse for converting DC voltage to AC voltage in accordance with an output request of a motor, and an inverter circuit that converts the DC voltage to the AC voltage with the PWM pulse generated by the PWM controller and drives a motor. The PWM controller changes the pulse width of the PWM pulse at predetermined timing on the upper side of the trapezoidal wave when the trapezoidal wave modulation using the trapezoidal wave is performed in the overmodulation region.

Inverter device and electric vehicle

Growing community of inventors

Tokyo, Japan

Midori Takaoka